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March 5, 1929. E. D. EDDY ET AL 1,704,466

comamm WASHER AND DRIER OF THE commuous CENTRIFUGAL TYPE Filed Dec. 12, 1924 2 Sheets-Sheet 1 INVENTORS E. 0.500)

.W P BY A CAM BEL March 5, 1929- E. D. EDDY ET AL 1,704,466

COMBINED WASHER AND DRIER OF THE CONTINUOUS CENTRIFUGAL TYPE FilggLDap. 12, 1924 2 sheets-sheet 2 INVENTORS E. D. EDDY BY A. W CAMPBELL Patented Mar. 5, 1929.

UNITED STATES PATENT; 1 osrr c s.

EDGAR DUNCOMBE EDDY AND ALBERT WELLINGTON". CAMPBELL, or TORONTO. ON-

ARIO, GANADA,-ASSIG1\TOB3S '10 EDDY SEED oLn'ANnns, mivrirnnor TORONTO,

CANADA, A JOINT-STOCK COMPANY..

COMBINED WASHER AND DRIERoF rnsoonrrnuons csNrRmUsAL TYPE.

Application filed DecemberlQ, 1924. Serial No. 755562.

Our invention relates to improvements in. combined Washers and driers of the contmnous centrifugal type and the ob ect of the inventionis to throw off the liquid with which will not become Wholly or partially clogged.

and thereby interfere With the effectiveness of the drying action.

A still further object is to devise means for conveying the material being treated from the intake to the discharge end of the machine and for scraping the screen in which it will be possible to actuate the scraping means at more nearly the speed of the screen or at any suitable relative speed, thus reducing Wear on both the screen and scrapers While maintaining the desired scraping action.

' Another object is to make possible the treating of small particles such as fine seed, crystals and the like continuously instead of by the batch methods, thus elfecting an economy in power, labour and time. I

Our invention consists of a combined Washer and drier constructed and arranged all as hereinafter more particularly described and illustrated in the accompanying drawing Fig. '7 is'a plan view of one of such scrapers.

Like. characters of reference indicate corresponding parts in the different views.

1 is the casing of the machine. 2 is the 1ongitudinal shaft extending therethrough and journalled on the bearings 3 disposed exteriorly thereof on the base 4. 5 isa drive pulley on the shaft 2. The end of the shaft remote from the driving pulley 5 is end-bored to constitute-the hollow interiorfi which is connected intermediately of its length with a transversely extending nozzle 7,th'e' hollow.

end ofthe shaft 2 being connected by the gland 8 With the water pipe 9 Which is connected with a vva'ter'supply.

10 is a circular spider provided. With the holloivboss l1 rotatable on the shaft 2. 12 is an opposed hollow boss rotatable on the shaft 2 in the vicinity of its other end and provided 21 by meansof Which the material to be dried, 1s lntroduced nto the interior of the screen 17.

The boss 12 is, provided With the driving pulley22. 23 and 24 are chutes depending from the casing 1 oneach side of the vertical 7 part1t1on25, the inner edge of which is inserted into a channel 26 in one of theannular members27 of the cage 16.

one end of the casing 1 and communicating through the spider 10 with the interior of the cage 16 and provided with a tangential.

discharge chute 29.

15 and the spiderlfl and adapt 28 is an annular collecting space formed in 80 are spaced apart bosses secured to the shaft 2 on each side of the nozzle 7 and provided With the opposed radially extending scraper and conveyor flight carrying arms 31. 32 are longitudinal scraper carrying rods journalled in bearing brackets 33 at the extremities of the arms 81. 33*are trans versely extending arms formed integrally with the bearing brackets 33 upon WlllClltllG conveyor flights 36 are mounted by having their brackets 34 connected to'a bar 35 Which is carried by the arms 33; The flights 36 are not adapted to contact with the inner surface of the screen 17 but are positioned a small distance therefrom in order to remove the bulk of material from the screen and for this purpose these flights. are set. at an inclislot 42 and inwardly extending lateral slots 43 into. which are inserted the opposed lugs 44 on the scraper holding members 39 and 40. A lug 44 is provided on opposite ends of the member-s39 and and registers with an in wardly extending slot 45 in the opposite scraper holding member.

The free ends 46 of the resilient members are threaded to receive the nuts 47 which when screwed up force the member 40 towards charge end of the screen.

the member 39 and thus grip the scraper 41 between such member 40 and the member 39, the slot 42 on each scraper 41 being provided to enable the scraper to straddle the resilient member and thus provide means for readily removing the scraper when it becomes worn. The scrapers 41 are designed to contact with the internal face of thescrcen 17 and thus keep the screenfrom clogging and remove from it the particles of material not removed by the flights 36. They are set at the same inclination as the flights 36 in order to grad ually' force the material towards the dis- These scraping elements may be replaced by brushes of wire or other suitable material if desired.

48 is a forked member secured to each rod 32 intermediately of its length and extending inwardly towards the shaft 2. 49 are outwardly extending lugs secured to the shaft 2 and having their extremities extending between the forked end of the forked member 48. 50 is "an adjusting screw threaded through one of the legs ofthe forked member 48 with which the lug 49 is adapted to coact, said adjusting screw 50 being provided with the handle 51. This mechanism is provided to vary the pressure of the scrapers 41 on the screen 17. The adjusting screws '50'through the spring members 38 limit the pressure of the scrapers 41 on the screen caused by centrifugal force. 7

The operation of our device is as follows:

The screen 17 mounted on the cage 16 is rotated by means of the drive pulley 22 through the boss 12, disc l3'and the plate 153 at a greater speed than the shaft 2 1S rotated by the pulley 5. As he shaft 2 carries the flights 36 and scrapers 41 it will be seen that such flights and scrapers are rotated at a slower speed than the screen, and consequentscrapers 41 on the internal face of the screen.

As the screen rotates in the direction indi cated by the arrow in Figure 4 the bulk of the particles of material and dirt therewith that is clinging to the screen will be removed oil by the flights 36, leaving a certain amount of finer par icles still-on the screen. This will occur due to the fact that the flights 36 do not contact with the screen but when the particular portion of the screen is further rotated it will come into contact with the scrap ers 41, which will remove such fine particles from the screen and thus prevent it from becoming clogged. Due to the fact that the flights 36 and scrapers 41 are pitched at an. angle, a spiral movement is given to the material on the screen which gradually works it along ten; ds the, discharge end, it being under-steed that a plurality of sets of flights and scrapers are used in the construction above referred to.

The material mixed with the liquid is introduced through the inlet pipe 21 into the interior of the screen and owing to the centrifu l action due to the rotation of the screen the liquid is thrown out therethrough into the casing 1 and discharged through the chute 23, the material being thus partially dried.

In order to wash any remaining liquid from the material, water is introduced through the nozzle 7 which rotates with the shaft 2 and the material is sprayed therewith. As the flights and scrapers move the material alongtowards the discharge end of the screen the washing water thrown oil from the material by centrifugal action and discharged through the chute 24, the material being discharged from the discharge end of the screen through the spider 1t) and into the annular space 28 and finally discharged through the chute by means of which it is carried to any convenient place.

If it desired to regulate the pressure of the scrap '7 41 on the screen 1'? the adjustscrewSU is screwed down closer to the p 49 and consequently the swi of the scrapers 41 about the rods 32 is limited. Such scrapers tend to swin outwardly due to centrifugal actionv imparted to them. by the rotation of the shaft A combined washer and drier constructed according to our invention is particularly applicable for drying seeds and can be used in connection with the seed separating apparatus described and claimed in United States Patent #1,452,457 issued April 17th, 1923, wherein the inlet pipe 21 would be connected to the seed discharge of such separating device. r

It is found in practice that when the seeds are discharged from the chute 29 they usually do not contain over 1% more moisture than when delivered to the separating apparatusfrom the seed houses or farms, it being understood that the seeds are delivered to my washer and drier from the seed separator in a substantially wet condition.

Although we have described our device as particularly applicable to the drying of seeds, especially line clover seeds it can also be used for drying many kinds of crystals or other material having large surface moisture, such as sugar, salt and wet grains.

Our device makes possible thetreatment of small particles contimmnsly instead of by the ers with the consequent decrease in wear on both screens and scrapers The device is susceptible to useas a drier alone by eliminating the use of the washing water in cases where it is not necessary to wash the material passing through the devlce.

What we claim as our invention is.

1. In a device of the character described, the combination with a shaft and means for driving the same, of a cylindrical screen rotatablymounted on the shaft, independent means for driving the screemmembers with radially extending arms secured to the shaft, longitudinally extending rods rotatably secured to the ends of the arms, screen noncontacting conveyor flight elements secured to the arms and screen contacting scraper elements secured to the rods, said non contacting elements functioning prior to the contacting elements. I

2. In a device of the character described, the combination with a shaft and means for driving the same, of a cylindrical screen rotatably mounted on the shaft, independent means for driving the screen, members with radially extending arms secured to the shaft, longitudinally extending rods rotatably secured to the ends of the arms, screen noncontacting conveyor flight elements secured to the arms and screen contacting scraper elements resiliently secured to the rods, said non-contact1ng elements funct1on1ng prlor to the contacting elements.

3. In a device of thecharacter described, the combination with a shaft and means for driving the same, of a cylindrical screen rotatably mounted on the shaft, independent means for driving the screen, members with radially extending arms secured to the shaft, longitudinally extendingrods rotatably secured to the ends of the arms, screen n0n-c0ntacting conveyor flight elements secured to he arms and screen contacting scraper elements resiliently secured to the rods, said noncontacting elements functioning prior to the contacting elements, both scraper and flight elements set at an angle to the longitudinal axial line of the screen. w

l. In a device of the character described, the con'ibinationwith a shaft and means for driving the'same, of a cylindrical screen rotatably mounted on the shaft, independent means for driving the screen, members With radially extending arms secured to the shaft, longitudinally extending rods rotatably secured to the ends'of the arms, screen noncontacting conveyor flight elements secured to the arms and screen contacting scraper elements resiliently secured to the rods, said non-contacting elements functioning prior to the contacting elements, both scraper and flight elements setat an angle to the longitudinal axial line. of the screen, and coacting means between the rods andshaft for controlling the pressure of the screen contacting scraper elements on the inner surface of the screen.

5. In a device of the character described, the combination with a shaft andmeans for driving thesame, of a cylindrical screen rotatably mounted on the shaft, independent means for driving the screen, members with radially extending arms secured tothe shaft, longitudinally extending rods rotatably secured to the ends of the arms, screen noncontactingconveyor flight elements secured to the arms and screen contacting scraper elements resiliently secured to the rods, said non-contacting elements functioning prior to the contacting elements, both the scraper and flight elements set at an angle to the longitudinal axial line of the screen, an inwardly extending forked member secured to each rod, an outwardly extending lug on the shaft coacting with each forked member, and an adjusting screw on each forked member adapted to coact with its shaft lug. I

EDGAR DUNCQMBE EDDY.

ALBERT WELLINGTON CAMPBELL. 

